However, Hutchins and other security analysts warned that "this is not over." The hackers responsible for this latest ransomware assault could simply change the code (or the domain, for that matter), redeploy it and start again. Copycats can also tweak and repurpose the malware to start their own campaigns.

And it looks like soon enough, that time is now.

New WannaCry Variants

As early as Sunday morning, new variants of the WannaCry ransomware have been sprouting up, including one that lacks the "kill switch" weakness.

The new variants appear to have been manually patched by still unknown groups and were not created by the authors of the original WannaCry campaign.

The first variant with a different kill switch domain reportedly started spreading on Sunday morning and was quickly followed by an updated version that removed the kill switch. (Note: The kill switch was discovered Saturday morning.)